if the extent of your philosophical review ends at the dictionary then we have little to discuss.
Otherwise you might want to explain the substantial difference between;
1) I disbelieve in the existence of God.
2) I believe God does not exist.
As I said early these are nothing more than semantic word games.
Atheism is disbelief of theistic claims about god(s). Period.
Your examples are of things
some atheists will claim but don't mix that with atheism. If an atheist wants to make such a claim, they will have to defend that claim. I.E. it is their problem.
The big problem for you is that atheism does not say that. What atheism says is : PROVE IT!
You are are playing words games that you think allows you to classify atheism as a religion. Which, theoretically, would allow you to attack atheism like any other religion. As William Lane Craig always says:
If atheism were true..... He always treats a positive claim made by some atheists as the actual definition of atheism. Even PhD can be stupid, I guess. Or should I say blind to their presuppositions?
In any event, as was stated later in this thread, atheism is a religion just like theism is a religion. In other words they are not religions.
Religions are a set of rules, actions, observances that define how one believes in the supernatural. Atheism (and theism as well) has no rules, no dogma, no liturgy or anything else one would associate with a religion.
Atheism/theism are completely separate from religion. Stop mixing them together.
There are religious atheists like Buddhists or Jainists.
There are non religious theists like some of the Founding Fathers, i.e. deists.